Philosophy of law is a branch of philosophy that explores the nature of law, legal systems, and their relationship to morality and justice. It addresses fundamental questions such as what is law, what gives it its authority, and how laws should be interpreted and applied. This field also examines the role of law in society, the limits of legal authority, and the ethical considerations behind legal decisions. Philosophers of law analyze legal concepts, principles, and doctrines in order to understand the nature of law and its impact on individuals and society.